Machine for automatically grinding spiral or twist drills.



No. 845,139. PATENTED FEB. 2651907.

N. STRUGK.

MACHINE FOR AUTOMATICALLY GRINDINGHSPIRAL 0R TWIST BRIEFS;

' APPLICATION FILED 13110.30, 1905f a gm' fim' m 845,139. IPATENTED FEB. 26,119O7.

' m, smncx. I MACHINE FDR AUTOMATICALLY eammwe SPIRAL 0R TWIST DRILLS.

APPLIUATION FILED DEG. 30, 1905.

8 3EEETS-BHEBT 2.

:NVENTQ'R No 845,189. if PATENTED-FEB. 26, 1907. N. STRUGK. Y MACHINE FOR AUTOMATICALLY GRINDING SPIRAL ORTWIST DRILLS.

APPLICATION FILED DEG.30, 1905.

8 sums-sunny a,

INVENTOR No. 345,139. 'PATENTED FEB. 26, 190?.

v N. Ste-BUCK.- MACHINE FOR AUTOMATICALLY GRINDING SPIRAL 0R TWiST DRILLs.

APPLICATION FILED DBO. 30, 1905.

' 8 SEEETS-SHEET :mo. 845,139. PATENJIED FEB. 26, 1907.

N.STRUGK.

MACHINE FOR AUTOMATICALLY GRINDING SPIRAL 0R TWIST DRIL LSI' APPLIOATION FILED DEO.30,'1905. a SHEETS-SHEET 5 No. 845,139. PATENTBD r53. 26, 1907. N.STRUGK.

MACHINE FOR AUTOMATICALLY GRINDING SPIRAL 0R TWIST DRILLS. APPLICATION FILED DEO.30,1905.

8 SHEETS-SHEET 6.

,Nof845,189. PQATENTED FEB. 26. 1907. N.YS TB.UGK. MACHINE FOR AUTOMATICALLY GRINDING SPIRAL OR TWIST DRILLS APPLICATION FILED DEO.30,1905.

8 SHEETS-SHEET 7.

WVENTQR WITNESSES in 845,139. ATENTED FEB. 26, 1907 N. STRUOK. H MACHINE FOR AUTOMATICALLY GRINDING SPIRAL 0R TWIST DRILLS.

APPLICATION PILED'DBG.30,1905.

,5, SHEETS--SHEET a.

\A/ITN EE S E5 1 E3. Chm/ M). v yam/45 mounted on a disk or carrier 1*, the two being NICOLAI STRUCK, OF ST PETERSBURG, RUSSIA.

MACHINE FGR'AUTOMATICALLY GRINDl NG SPIRAL 0R TWIST DlllLLSl To all whom it may concern.-

Be it-known that I, N IOOLAI STRUCK, a citi zen of Russia, residing at 23 Golovinski Perenlok, St. Petersburg, Russia, have invented new and useful Improvements in Machines for Automatically Grinding Spiral or Twist:

Drills, of which the following is a specification'. This invention relates to an apparatus for grinding helical or twist drills, the object being to enable the drills to be ground auto matic'ally without necessitating the supervision of an attendant and also to providefor adjustability within 'wide limits, sothat drills of varying shapes and diameters can be ground for lurtlier use.- I i r One form of machine according to the invention is illustrated in the accompanying drawings, Figure 1 being a side elevation, Fig. 2 a plan, and Fig. 3 an end elevation. Figs. 4 to 7 are respectively end elevation, side sectional elevation, end sectional elevation, and plan of the drill-carrier. Figs. 8 to' 12 are various views of details of the drill-carrier. Figs. 13, 14, and 15-illustrate the drill in three positions-at different periods of its inotion.- l igs. 16 and 17 illustrate the adjustment of the grindstone for various thickn'essesofdrill. 1

In the exampleillustrat-ed the head-stock B of the grindstone is traversable in guides on the bed A, the latter being formed as a water-tank. The head-stock 15 supports the mandrel of the grindstone, the mandrel being fitted with-a driving-pulley C. The grind stone is in the form of a cylindrical ring' inclosed within a guard W, which catches the it back to thetank. A reciprocating motion is continually imparted to the head-stock B by a rod Z, connected to a bolt 0 on the head stock'and driven'ofi' an eccentric e, mounted on or connected with a worm-wheel driven by a'worm-shaft 8, provided with a pulley 1-.- The working surface of the grindstone thercby receives a combined circular and reciprocatorymovement, and the wearing ell'eet of I the tool is thus distributed over the whole i various diameters, the position of the bolt 0 area of the annular surface of thestone. 'In order to render this wear uniform for drills of E on the head-stock can be shifted relatively to i thecon'necting-rod by a screw (1, and a gage m may be used, between the jaws of which i thepdrill to be operated on is fitted before the Specification of Letters Patent. Application filed December 30,19,05: Serial lflo. 294,352.

l igs. lo and 17. ,by this meansit is always Patented Feb. 26, 1907."

' machine is started in such a manner that the H fidJUSLlIlg-SCICW is rotated, so that the, jaws or the gage ust touch the drill, as shown in possible to so adjust the'center ol' the work- 7 ing surface of the grinding-disk that it coin-- cities with the center or the drill-races in the saine vertical plane.

ing water to the grinding-awn is also operated from the shatter the pulley r". 'lhe A pump p for supplybracliet 'l is iitted to the supporting-lugs U of the bed, so-tnat thedrni-tabie can be swung round as desired.

'lo the pivot U, on which the drill-table swings, two pulleys ff are htted,'over which a belt is conducted and is carried to the pul-I ley g of the-drill-carriage. through the interinediaryof a clutch or coupling n,'operates a hollow shaft, which by this Pulley 9;

means or a worm o and worm-wheels g g oc-' casions the continual rotation of the drill around itsaxis while being gr d. and swinging motion of the drill-supporting earf riage and'its parts toward the bracket '1,'so-

as to produce around the axis of rotation a, situated near the grinding-disk, a rotative 'Iected' oy the'worm-wheel q, fitted to the movement as well as a reciprocatory movea vertical shaft g, which primarily sheets the swingingniotion of the table by means of an rl iediate gear, and, secondly, a dra i .1.

back of the drill by means of a cam-gear with a View to reversing to the other edgejof the drill. The cam-shaped disk 3i ot'the shaft 9 works with the roller u on the arm '0, united 3 to the swinging plate M, the shaft g" be ng carried on the drill holder table w; A move ment in the longitudinal axis of the drill is imparted to this table by the cam-gear, so

that a spring 00. is alternately stretched and released, which occurs at each half-revolution of the sleeve ll, which receive the drill. pivot z of the crank-disk t ofthe shaft g" engages in a slot of the arm g on the carrier ,T, by which the plate M on the carrier '1 swingsaround the bolt a and guided-by the segment J 8 on the machine-frame. The slide can, if

The

desired, be made fast'to thesupport Tby means of the seginentar guide 8'. manner as the drill turns onceon its axis it receives two swinging motionsv around the pivot 0 In order that the cutting edgeshall not touch against thegrindstone on the In this IIC i return, a cam-gear i u o is provided, which with a ratchet-wheel it on the table w.

draws the drill back at the right moment in edges engages in a groove cut crosswise to the an opposite direction to the action of the sol-race 1n the angle between the two main s, ring w. A controlling-gear is connected to bevel-plates.

this and pushes the drill Ior'ward for grinding. A-pawl A is titted to the plate M and engages vention, what 1 claim as new, and desire to 'lms ratchet-wheel by means of pins operates the lover of a pawl ii of a second ratchet-wheel R, the shaft of which carries an eccentric E and is litted to the plate M. The spring a forces the table w against the eccentric, by the rotation of which the forward motion is obtained. After i}=%111fli11 number of reciprooming movements the eccentric automatically en'ccts a withdrawal of the drill, so that the latter is not (Werground. The clutchcoupling a of the hollow shaft of the pulley g operates in con unction with the PIOJQXZUOD i on the bracket it, so as to tree the coupling by the pro ection i to hold the drill-carrier exactly in the position which'is most suitable for the fitting in of the next drill to be ground. The drill is passed into the sleeve ti and can be pushed out of the centeringchucl: o by means of a central screw-rod '0.

be: placing the point of the drill in position on the gn'nding-body a special device (see l igs S to 12) is employed, which is mounted in a conical sleeve bl on the'front goentl of the plate M. In these figures, big. 8

a viewef one of the beveling-holders detached,

' To place, as far as possible, the drill m ex,

actly the proper position and to allow of varying thicknesses of the cuttingedges on one band and their theoretical point on the other, the main'plate o of the bevel arranged on its supporting-spindle has two half-plates sloping toward each other, the opposite inclinauon of which correspond to that of the point of the drill, as may be seen from big 9. 011 each of the half-plates a shoe 0 is adjustable in such a way that the front surlaces of the horizontal middle line of the plate .0,,'. serving as a receiver for the drill, can be adjusted to it in a parallel direction. ln this way a secure ad ustment within wide limits is obtained for drills of varying size, as can be seen'l'ro'm the above nguies. by means of the device the'theoretical point of the drill in one vertical axis can lac-brought into the same plane as the cutting edges of the 'drill in spite of their having varying thicknesses. ror conveniently nianipulat- .mg the drill-holding shoes on the bevelplate they are prererably provided with a screw or other arrangement for attachment thereto.

'lhe sho'es receiving the drill are mounted cnthe main bevellate 0,- being adjustable in inclined slots. -lne drill'ihes with its principal edges on these shoes, while its middle having now particularly described my insecure by Letters latent, is 1. A machine for grinding drills comprismg a rotary grinder, means for imparting a transverse reciprocating movement thereto dui-ing its rotation, a drill supported with its cutting edge in proximity to said grinder, means for rotating the drill and means for swinging it during each rotation thereof.

2. A machine Ior grinding drills comprismg a rotary grinder, means for imparting a transverse reciprocating movement thereto during its rotation, a dull supported with its cutting edge in proximity to said grinder,

means for rotating the drill, and means for swinging it during each rotation thereof, and means tor automatically moving the drill toward and from the grinder.

3. in a device or the character described,

the combination with a suitable support and a rotary grinder, of a drill-supporung table, a drill-carrier longitudinally movable thereon, means for reciprocating said carrier, and pawl-and-ratchet-controlled means for'regulating the amount of said reciprocation said pawi-andratchet means being rendered ef- Iective by the reciprocation of the drill-carrler.

4. In a device of the character described,

the combination with a suitable support and grinder, of a drill-supporting table, a drillcarl-ier longitudinally movable thereon, a drill carried there by with means for rotating it, a spring tending to draw said carrier toward the grinder, a cam device for moving said carrier against the action of the spring, a cam for limiting the movement of the carrier toward the grinder, a ratchet-wheel on the carrier operatively connected with said cam, and a pawl carried by the table and ongaging the ratchet-wheel.

b. in a device of the character described,

a suitable support, a grinder rotatably mounted thereon, a drill-supporting table pivoted to said support to swing on a vertical axis, a drill mounted on said support to have a rotary and reciprocating movement, operating means for imparting such movement to the drill, and a device for swinging said supporting-table, said device being operated from the operating means for the drill.

6. in a device-gr the class described, a suitable support, a grinder carried thereby, a drill-supportmg table pivoted to said support, a will rotatably carried bysaid support, gearing for rotating said drill, and an eccentric-pin engaging a guide on the sup port and operated from the said gearing for swinging the table.

7. in a device of the class described, the

, combination with'& means for supporting the drill and rotating it during the grinding ac- I In testimony whereof I have signed my tion, of a rotary grinder, means for moving name to this specification in the presence of the same transversely of its axis of rotation, I two'subscribing Witnesses. means for adjusting the grinder with relation N ICOLAI STRUCK.

5 to such moving means, and a drill-gage for Witnesses:

securing adjustment in accordance with the H. A. LQVIAGUINE, drill to be ground. TH. TRYMAK. 

